JP2017035755A - Cutting device of corrugated cardboard sheet, cutting control device thereof and manufacturing device of corrugated cardboard sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable continuous cutting work without stopping conveyance of a corrugated cardboard sheet and reduce the production cost by suppressing the occurrence of spoilage at the time of job change of changing the cutting width of the corrugated cardboard sheet in a cutting device of the corrugated cardboard sheet, a cutting control device of the corrugated cardboard sheet and a manufacturing device of the corrugated cardboard sheet.SOLUTION: A cutting device of a corrugated cardboard sheet comprises: a printer 21 which prints a cutting mark M on a double-side corrugated cardboard sheet E; a slitter-scorer 23 which cuts the double-side corrugated cardboard sheet E by a prescribed width; a cut-off 24 which cuts the double-side corrugated cardboard sheet E by a prescribed length; a mark detector 40 which detects a cutting mark M; a movement device 41 which moves the mark detector 40 along the width direction of the double-side corrugated cardboard sheet E; and a cutting control device 52 which performs operation control of the cut-off 24 on the basis of the detection result of the mark detector 40, and moves the mark detector 40 by the movement device 41 on the basis of the job change timing data and mark position information after job change.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a corrugated sheet cutting device for cutting a corrugated cardboard sheet in which a front liner, a corrugated core and a back liner are bonded to a predetermined size, a corrugated sheet cutting control device for controlling the cutting device, and a corrugated cardboard. The present invention relates to an apparatus for manufacturing a corrugated cardboard sheet having a sheet cutting device.

  A corrugating machine as a corrugated cardboard manufacturing apparatus includes a single facer that forms a single-sided cardboard sheet and a double facer that forms a double-sided cardboard sheet by bonding a front liner paper to the single-sided cardboard sheet. A single facer forms a corrugated core paper (core) into a corrugated shape, and a back liner is laminated to form a single-sided cardboard sheet. A double facer forms a double-sided cardboard sheet by laminating a front liner to the single-sided cardboard sheet. . The continuous double-sided corrugated cardboard sheet produced by the double facer is cut into a predetermined width by a slitter scorer and cut into a predetermined length by a cut-off device to form a corrugated cardboard sheet.

  In this corrugating machine, the corrugated cardboard sheet is printed with a cutting mark for cutting to a predetermined length on the surface, the detector detects this cutting mark, and the cut-off device is based on the detection result. Operates to cut the cardboard sheet into a predetermined length. An example of such a corrugating machine is described in Patent Document 1 below. In the production of corrugated cardboard sheets by a corrugating machine, when this cutting mark is not printed, a preprinted sheet in which a liner printed with the cutting mark is bonded is used, or the cutting mark exists on the back surface. Sometimes.

European Patent No. 1459878 JP 2004-082279 A

  By the way, when using a preprinted sheet, the corrugated cardboard sheet is cut to a predetermined width by a slitter scorer and then cut to a predetermined length by a cut-off device. In this case, when the slitter scorer cuts the corrugated cardboard sheet to a predetermined width, both ends in the width direction of the corrugated cardboard sheet are cut off as unnecessary portions (trims). Printed on the inside. However, if the cutting width of the corrugated cardboard sheet is changed, the width of the unnecessary portion is changed, and the printing position of the cutting mark is shifted in the width direction, so that the detector may not be able to detect the cutting mark.

  In addition, as what moves the detector which detects a mark position, there exists a thing described in the said patent document 2, for example. However, this patent document 2 moves the mark detector when the printing machine is stopped before the start of printing. Therefore, it is difficult to move the mark detector without stopping the conveyance of the cardboard sheet when the cutting width is changed during the production of the cardboard sheet.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and enables continuous cutting work without stopping the conveyance of the cardboard sheet when the job is changed in which the cutting width of the cardboard sheet is changed. It is an object of the present invention to provide a corrugated sheet cutting device, a corrugated sheet cutting control device, and a corrugated sheet manufacturing apparatus that can reduce the production cost by suppressing the production cost.

  In order to achieve the above object, a cardboard sheet cutting apparatus according to the present invention includes a digital printer that prints a cutting mark on a cardboard sheet being conveyed, and a predetermined width along the longitudinal direction of the cardboard sheet being conveyed. A first cutting machine that cuts the cardboard sheet into two, a second cutting machine that cuts the cardboard sheet being conveyed into a predetermined length along the width direction, and mark detection that detects the cutting marks in the cardboard sheet being conveyed And a control device for controlling the operation of the first cutting machine and the second cutting machine and changing a control setting value of the mark detector based on print image information. .

  Accordingly, when the digital printing machine prints a cutting mark on the cardboard sheet, the first cutting machine cuts the cardboard sheet to a predetermined width along the longitudinal direction, and the mark detector detects the cutting mark, the second cutting is performed. The machine cuts the cardboard sheet into a predetermined length along the width direction. At this time, when the print image information is changed, the setting value for controlling the mark detector is changed, and the control device can perform continuous cutting work without stopping the conveyance of the cardboard sheet. Efficiency can be improved and the production cost can be reduced by suppressing the generation of waste paper.

  In the cardboard sheet cutting device according to the present invention, the print image information is information for changing a print image printed on the cardboard sheet, and the controller detects the mark detector based on the changed print image. It is characterized in that the control set value of is changed.

  Therefore, when the print image is changed, the control device changes the set value for controlling the mark detector according to the changed image, and continuously without stopping the cardboard sheet conveyance. Cutting work can be performed.

  In the cardboard sheet cutting device of the present invention, a moving device is provided for moving the mark detector along the width direction of the cardboard sheet, and the print image information is changed according to the change of the print image. The cutting width of the corrugated cardboard sheet by the first cutting machine, the control set value is a detection position by the mark detector, and the control device moves the moving device based on the cutting width of the corrugated cardboard sheet to be changed. Thus, the mark detector is moved to the detection position after the change.

  Therefore, when the cutting width of the corrugated cardboard sheet is changed, the control device moves the mark detector by the moving device based on the changed cutting width of the corrugated cardboard sheet, and continuously without stopping the conveyance of the corrugated cardboard sheet. The cutting work can be performed, the work efficiency can be improved, and the production cost can be reduced by suppressing the generation of waste paper.

  In the cardboard sheet cutting device of the present invention, the print image information is job change information in which a cutting width of the cardboard sheet by the first cutting machine is changed during conveyance of the cardboard sheet, and the control device includes: When the job is changed, the mark detector is moved by the moving device based on job change timing data and mark position information after the job change.

  Therefore, when there is a job change in which the cutting width of the cardboard sheet is changed by the first cutting machine, the control device moves the mark detector by the moving device based on the job change timing data and the mark position information after the job change. To do. That is, the control device moves the mark detector to a position based on the changed mark position information at the timing when the job is changed while the cardboard sheet is conveyed. Therefore, when the job is changed in which the cutting width of the cardboard sheet is changed, continuous cutting work can be performed without stopping the conveyance of the cardboard sheet, and the work efficiency can be improved. Further, the mark detector can be quickly moved to a predetermined position when a job is changed, and the production cost can be reduced by suppressing the occurrence of waste paper.

  In the corrugated cardboard sheet cutting device according to the present invention, the job change timing data includes data of a target number of prints in a predetermined job, and the control device includes the actual number of prints of the cutting mark corresponding to the job being executed. When the target print number is reached, the digital printing machine switches from printing the cutting mark corresponding to the job being executed to printing the cutting mark corresponding to the next job, and switching the cutting mark When the position reaches the second cutting machine, the mark detector is moved by the moving device.

  Therefore, when the switching position at which the printing of the cutting mark corresponding to the job being executed is switched to the printing of the cutting mark corresponding to the next job reaches the second cutting machine, the mark detector is moved by the moving device. Thus, it is possible to continue the cutting operation after changing the job without stopping the conveyance of the cardboard sheet.

  In the corrugated cardboard sheet cutting device according to the present invention, the mark position information is print position data of the cutting marks in the longitudinal direction of the corrugated cardboard sheet, and the control device uses the moving device when the job is changed. The mark detector is moved to a position where the cutting mark can be detected after the job is changed.

  Therefore, when the job is changed, the card detector can be continuously cut even after the job is changed by moving the mark detector to a position where the cutting mark can be detected after the job is changed.

  In the corrugated cardboard sheet cutting device of the present invention, when the first job is changed to the second job, the mark detector is moved from the detectable position in the first job to the detectable position in the second job. Correspondingly, an idle running length of the cardboard sheet is set, and the control device controls the printing timing of the digital printing machine according to the idle running length when a job is changed. It is said.

  Therefore, when there is a job change, by controlling the printing timing of the digital printing machine according to the free running length of the cardboard sheet, the waste paper length corresponding to the free running length of the cardboard sheet is As a result, the non-defective product and the defective product can be appropriately sorted, and the length of the waste paper of the corrugated cardboard sheet can be shortened as much as possible.

  In the cardboard sheet cutting apparatus of the present invention, job data includes an image of the cutting mark, a printing position of the cutting mark, a printing color of the cutting mark, a cutting width and a cutting length of the cardboard sheet. The number of manufactured cardboard sheets is set, and the control device controls the digital printing machine, the first cutting machine, the second cutting machine, and the moving device based on the job data. It is a feature.

  Therefore, printing of a cutting mark on the corrugated cardboard sheet, cutting of the corrugated cardboard sheet, and movement of the mark detector are performed based on the job data, and the control can be simplified.

  In the cardboard sheet cutting device of the present invention, a cutting upper limit length is set by adding a margin length to the cutting length of the cardboard sheet, and the control device detects the mark exceeding the cutting upper limit length. When the cutting device does not detect the cutting mark, the second cutting machine is operated when the cutting upper limit length is exceeded.

  Therefore, when the mark detector does not detect the cutting mark beyond the upper cutting limit length, by cutting the corrugated cardboard sheet by the second cutting machine, even if a detection error of the cutting mark by the mark detector occurs, The continuous cardboard sheets are not conveyed downstream, and the cardboard sheets are not adversely affected by stacking and discharging.

  In the cardboard sheet cutting device of the present invention, the print image information is a print color of the cutting mark, and the control device corrects a detection result of the mark detector based on a print color of the cutting mark. It is characterized by doing.

  Therefore, by correcting the detection result of the mark detector based on the printing color of the cutting mark, it is possible to improve the detection accuracy by eliminating the non-detection of the mark detector due to the change in shading of the cutting mark.

  In the cardboard sheet cutting device of the present invention, the control device calculates a deviation between a target cutting length and an actual cutting length of the cardboard sheet.

  Therefore, by calculating the deviation between the target cutting length and the actual cutting length of the cardboard sheet, the cutting accuracy of the cardboard sheet can be confirmed based on this deviation.

  In the cardboard sheet cutting device of the present invention, the control device prints a cutting mark by the digital printing machine when a deviation between the target cutting length and the actual cutting length exceeds a preset allowable value. It is characterized by correcting data.

  Therefore, when the deviation between the target cutting length and the actual cutting length exceeds the allowable value, the digital printing machine can correct the printing data of the cutting mark by the digital printing machine, and the digital printing machine can respond to the expansion or contraction of the cardboard sheet. The printing position of the cutting mark can be changed, and the cutting accuracy of the cardboard sheet can be improved.

  In the cardboard sheet cutting apparatus of the present invention, the digital printing machine is capable of printing a picture on a cardboard sheet being conveyed, and uses at least a part of the picture as the cutting mark.

  Therefore, by using at least a part of the pattern printed on the cardboard sheet by the digital printing machine as a cutting mark, it is not necessary to print a dedicated cutting mark, and the printing cost can be reduced.

  The corrugated cardboard sheet cutting control apparatus according to the present invention includes a digital printing machine that prints a cutting mark on a corrugated sheet being conveyed, and a first cutting machine that cuts the corrugated sheet being conveyed to a predetermined width along the longitudinal direction. And a mark detector for detecting the cutting mark in the cardboard sheet being conveyed, and the cardboard sheet being conveyed is cut into a predetermined length along the width direction based on the detection result of the mark detector. A cardboard sheet cutting apparatus having a second cutting machine, wherein the control setting value of the mark detector is changed based on print image information.

  Therefore, when the print image information is changed, the setting value for controlling the mark detector is changed, and continuous cutting work can be performed without stopping the conveyance of the cardboard sheet, thereby improving work efficiency. And the production cost can be reduced by suppressing the generation of waste paper.

  The corrugated board manufacturing apparatus of the present invention also includes a single facer for manufacturing a single-sided cardboard sheet by attaching a second liner to corrugated core paper, and a first liner on the core paper side of the single-sided cardboard sheet. A double facer for producing a double-faced corrugated cardboard sheet together with the cardboard sheet cutting device.

  Accordingly, the single facer manufactures a single-sided cardboard sheet by laminating the second liner to the corrugated core, and the double facer has the first liner on the center side of the single-sided cardboard sheet manufactured by the single facer. A double-sided cardboard sheet is manufactured by laminating. When the digital printing machine prints a cutting mark on the cardboard sheet, the first cutting machine cuts the cardboard sheet to a predetermined width along the longitudinal direction, and the mark detector detects the cutting mark, the second cutting is performed. The machine cuts the ball sheet into a predetermined length along the width direction. At this time, if the print image information is changed, the setting value for controlling the mark detector is changed, and continuous cutting work can be performed without stopping the conveyance of the cardboard sheet, thereby improving work efficiency. This can reduce the production cost by suppressing the generation of waste paper.

  According to the corrugated sheet cutting apparatus, corrugated sheet cutting control apparatus, and corrugated sheet manufacturing apparatus of the present invention, since the control setting value of the mark detector is changed based on the print image information, the conveyance of the corrugated sheet is stopped. The cutting operation can be performed continuously without any loss, and the production cost can be reduced by suppressing the generation of waste paper.

FIG. 1 is a schematic view showing a corrugating machine as a corrugated board manufacturing apparatus of the present embodiment. FIG. 2 is a schematic configuration diagram illustrating a cardboard sheet cutting device according to the present embodiment. FIG. 3 is a flowchart showing disconnection control at the time of job change. FIG. 4 is a plan view for explaining the cutting position of the cardboard sheet at the time of job change.

  Exemplary embodiments of a corrugated sheet cutting apparatus, corrugated sheet cutting control apparatus, and corrugated sheet manufacturing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  FIG. 1 is a schematic view showing a corrugating machine as a corrugated board manufacturing apparatus of the present embodiment.

  In this embodiment, as shown in FIG. 1, a corrugating machine 10 as a corrugated board manufacturing apparatus has a corrugated core (core paper) B as a second liner, for example, a back liner C bonded together. A single-sided cardboard sheet D is manufactured, and a double-sided cardboard sheet E is manufactured by bonding, for example, a front liner A as a first liner to the center B side of the manufactured single-sided cardboard sheet D.

  The corrugating machine 10 includes a mill roll stand 11 with a core B, a preheater (preheating device) 12, a mill roll stand 13 with a back liner C, a preheater (preheating device) 14, a single facer 15, and a bridge 16. The roll roll stand 17 of the front liner A, the preheater (preheating device) 18, the glue machine 19, the double facer 20, the printing device 21, the rotary shaft 22, the slitter scorer 23, the cut-off 24, and the stacker 25. have.

  The mill roll stand 11 is provided with a roll paper in which a core paper having a core B formed on each side is wound in a roll shape, and a splicer (paper splicing device) 11 a for performing paper splicing is provided above the mill roll stand 11. Is provided. When paper is fed from one roll paper, the other roll paper is loaded and paper splicing preparation is made. When the remaining base paper of one roll paper is reduced, the splicer 11a joins the base paper of the other roll paper. Then, while the base paper is being supplied from the other roll paper, one roll paper is loaded and paper splicing preparation is made. In this way, the base paper is sequentially spliced and continuously fed from the mill roll stand 11 toward the downstream side.

  On the other hand, the mill roll stand 13 is provided with roll paper on which the back liner C is wound in rolls on both sides, and a splicer 13a for performing paper splicing is provided above the roll paper. When paper is fed from one roll paper, the other roll paper is loaded and paper splicing preparation is made. When the remaining base paper of one roll paper becomes small, the splicer 13a joins the base paper of the other roll paper. Then, while the base paper is being supplied from the other roll paper, one roll paper is loaded and paper splicing preparation is made. In this way, the base paper is sequentially spliced and continuously fed from the mill roll stand 13 toward the downstream side.

  Each preheater 12 and 14 preheats the core B and the back liner C, respectively. Each preheater 12 and 14 has a heating roll to which steam is supplied inside, and the base paper (core B, back liner C) continuously fed from the mill roll stands 11 and 13 is used as this heating roll. The base paper is heated to a predetermined temperature by being wound and conveyed.

  The single facer 15 has a pressure belt 15a, an upper roll 15b, and a lower roll 15c. The back liner C heated by the preheater 14 is transferred to the nip portion between the pressure belt 15a and the upper roll 15b. On the other hand, the core B heated by the preheater 12 is processed into a wave shape at the meshing portion between the upper roll 15b and the lower roll 15c, and then transferred to the nip portion between the pressure belt 15a and the upper roll 15b.

  A gluing device 15d is disposed in the vicinity of the upper roll 15b. This gluing device 15d has a gluing roll for gluing to the core B. The core B that is stepped at the meshing portion between the upper roll 15b and the lower roll 15c is glued to the top of each stage by a gluing device (glue roll) 15d, and at the nip portion between the pressure belt 15a and the upper roll 15b. A single-sided cardboard sheet D is formed by being bonded to the back liner C.

  A take-up conveyor 31 is provided obliquely above and downstream of the single facer 15 in the conveying direction. The take-up conveyor 31 is composed of a pair of endless belts, and has a function of sandwiching the single-sided cardboard sheet D formed in the single facer 15 and conveying it to the bridge 16. The bridge 16 functions as a retaining portion for temporarily retaining the single-sided cardboard sheet D in order to absorb the speed difference between the single facer 15 and the double facer 20.

  The mill roll stand 17 is provided with roll paper on which the front liner A is wound in rolls on both sides, and a splicer 17a for performing paper splicing is provided above the roll paper. When paper is fed from one roll paper, the other roll paper is loaded and paper splicing preparation is made. When the remaining base paper of one roll paper is reduced, the splicer 17a joins the base paper of the other roll paper. Then, while the base paper is being supplied from the other roll paper, one roll paper is loaded and paper splicing preparation is made. In this way, the base paper is sequentially spliced and continuously fed from the mill roll stand 17 toward the downstream side.

  The preheater 18 has a heating roll for the single-sided cardboard sheet D (hereinafter referred to as a single-stage sheet heating roll) 32 and a heating roll for the front liner A (hereinafter referred to as a front liner heating roll) 33. The single-stage sheet heating roll 32 has a winding amount adjusting device and is heated to a predetermined temperature by supplying steam therein, and the back liner C side of the single-sided cardboard sheet D is wound around the circumferential surface. The single-sided cardboard sheet D can be preheated. On the other hand, the front liner heating roll 33 similarly has a winding amount adjusting device and is heated to a predetermined temperature by supplying steam therein, and the front liner A is wound around the peripheral surface. The front liner A can be preheated.

  The glue machine 19 has a gluing device and a pressure device. The single-sided corrugated cardboard sheet D heated by the single-stage sheet heating roll 32 is guided in the glue machine 19 on the way, and passes between the rider roll and the glued roll at each top of the stage of the core B. It is glued.

  The single-sided cardboard sheet D glued by the glue machine 19 is transferred to the double facer 20 in the next process. Further, the front liner A heated by the front liner heating roll 33 is also transferred to the double facer 20 through the glue machine 19.

  The double facer 20 is divided into a heating section 20a on the upstream side and a cooling section 20b on the downstream side along the running line of the single-sided cardboard sheet D and the front liner A. The single-sided cardboard sheet D glued by the glue machine 19 is carried between the pressure belt 34 and the hot plate 35 by the heating section 20a, and the front liner A is positioned on the core B side of the single-sided cardboard sheet D. Is carried between the pressure belt 34 and the hot plate 35. Then, after the single-sided cardboard sheet D and the front liner A are carried between the pressure belt 34 and the hot plate 35, the single-sided cardboard sheet D and the front liner A are integrally transferred toward the cooling section 20 b in a state where they are vertically overlapped. During this transfer, the single-sided cardboard sheet D and the front liner A are heated while being pressurized, so that they are bonded together to form a continuous double-sided cardboard sheet E. The double-sided cardboard sheet E is naturally cooled when being conveyed while being sandwiched between the pressure belt 34 and the conveyance belt 36 in the cooling section 20b.

  The printing device 21 is disposed between the mill roll stand 17 and the preheater 18, reverses the front liner A, and prints a pattern and a cutting mark on the surface. The printing device 21 has a plurality of guide rollers 37 for reversal, an ink jet printer 38 as a digital printing machine (variable printing machine) for color printing, and a drying device 39 for drying ink. The digital printing machine is a plateless printing machine, and is not limited to the ink jet printer 38. An electronic printing apparatus or the like may be used, and the drawing system is not questioned. Therefore, since the lower surface of the front liner A fed out from the mill roll stand 17 is the surface, the surface liner A is temporarily reversed by the plurality of guide rollers 37 so that the surface becomes the upper surface. The ink-jet head 38 prints a pattern or a cutting mark on the surface (upper surface) of the inverted front liner A in color. In this case, only the cutting mark may be printed without printing the pattern. The drying device 39 dries a pattern printed on the surface of the front liner A and a cutting mark (ink).

  The double-faced cardboard sheet E manufactured by the double facer 20 is transferred to the rotary 22. The rotary 22 cuts the double-sided corrugated cardboard sheet E in the width direction in full width or partially in the case where the lamination is stabilized in the initial operation stage. The slitter scorer 23 cuts the wide double-sided corrugated cardboard sheet E along the transport direction so as to have a predetermined width, and processes a ruled line extending in the transport direction. The slitter scorer 23 includes a first slitter scorer unit 23a and a second slitter scorer unit 23b having substantially the same structure arranged along the conveying direction of the double-faced cardboard sheet E. The first slitter scorer unit 23a and the second slitter scorer unit 23b have a plurality of sets of upper ruled line rolls and lower ruled line rolls arranged facing each other across the double-sided cardboard sheet E in the width direction. A plurality of slitter knives arranged on the lower side are provided in the width direction.

  The cut-off 24 is formed by cutting the double-faced cardboard sheet E cut in the transport direction by the slitter scorer 23 along the width direction into a plate-like double-faced cardboard sheet F having a predetermined length. This cut-off 24 is a slitter scorer 23 which receives and processes two double-sided corrugated cardboard sheets E cut into a predetermined width along the conveying direction in two upper and lower tiers. It has become. The cut-off 24 has a mark detector 40. When the mark detector 40 detects a cutting mark printed on the double-sided cardboard sheet E (front liner A), the double-sided cardboard sheet E is moved to a predetermined length. Cut in the width direction. The stacker 25 stacks the double-sided cardboard sheets F cut by the cut-off 24 and discharges them as products to the outside of the machine.

  Here, the cardboard sheet cutting apparatus of the present embodiment will be described. The cardboard sheet cutting device of this embodiment includes a printing device 21, a slitter scorer (first cutting machine) 23, a cut-off (second cutting machine) 24, and a control device. When the mark detector 40 detects a cutting mark on the double-sided cardboard sheet E, the cut-off 24 is driven and controlled so as to cut the double-sided cardboard sheet E to a predetermined length. Further, when there is a job change in which the cutting width of the double-sided corrugated cardboard sheet E is changed by the slitter scorer 23 while the double-sided cardboard sheet E is being conveyed, the control device changes the job change timing data and the position of the cutting mark after the job change The mark detector 40 is moved based on the information.

  FIG. 2 is a schematic configuration diagram illustrating a cardboard sheet cutting device according to the present embodiment.

  In the cardboard sheet cutting apparatus according to the present embodiment, as shown in FIG. 2, the mark detector 40 of the cut-off 24 is moved along the width direction of the double-sided cardboard sheet E by the moving device 41, thereby cutting marks. Can be adjusted in the width direction of the double-faced cardboard sheet E.

  A printing control device 51 is connected to the printing device 21, and the printing control device 51 can drive and control the printing device 21. The slitter scorer 23 and the cut-off 24 are connected to a cutting control device 52, and the cutting control device 52 can drive and control the slitter scorer 23 and the cut-off 24. Further, the cutting control device 52 is connected to the mark detector 40, receives information that the mark detector 40 has detected the cutting mark, and drives the cutoff 24 based on this information. Further, the cutting control device 52 is connected to the moving device 41 and drives the moving device 41 based on the job change timing data and the position information of the cutting mark after the job change.

  The print control device 51 and the cutting control device 52 are connected to each other and to the production management device 53. Therefore, the print control device 51 and the cutting control device 52 can exchange data (information) with each other, and the production management device 53 receives data (information) between the printing control device 51 and the cutting control device 52. Exchange is possible. Further, the production management device 53 is connected to a data storage unit 54, and can store various types of input data and can retrieve the stored data. The control device according to the present embodiment includes a print control device 51, a cutting control device 52, and a production management device 53.

  As image data, a pattern image that forms part of job data, a cutting mark image, a printing position of the pattern and the cutting mark, a printing color of the pattern and the cutting mark, and a cutting width of the double-sided cardboard sheet The cutting length is set, and this image data is input to the print control device 51. In addition, as the production management data, a target production number (target print number) of the double-sided corrugated cardboard sheets constituting a part of the job data is set, and the data of the target production number is input to the production management device 53 and stored therein. Stored in the unit 54.

  The printing control device 51 drives and controls the printing device 21 based on the input image data, and prints a pattern and a cutting mark using a predetermined color at a predetermined position on the front liner A. The printing control device 51 outputs the input image data to the cutting control device 52. The cutting control device 52 controls the driving of the slitter scorer 23 based on this image data, and cuts the double-sided cardboard sheet E to a predetermined width. The cut-off 24 is driven and controlled based on the cutting mark detected by the mark detector 40, and the double-sided cardboard sheet E is cut to a predetermined length.

  The production management device 53 outputs the input production management data to the print control device 51, and the print control device 52 drives and controls the printing device 21 based on this production management data, and a predetermined number of pictures are given to the front liner A. And a cutting mark is printed.

  The production management device 53 receives a plurality of job data (target production number data) and is stored in the data storage unit 54. For example, when the first job is completed and the process shifts to the second job. The mark detector 40 is moved by the moving device 41 based on the job change timing data and the position data information of the cutting mark after the job change.

  Here, the job change timing data is the target production number data (target print number data) in the job being executed, and the print control device 51 determines that the actual print number of the cutting marks corresponding to the job being executed is the target print. When the number of sheets is reached, the printing apparatus 21 switches from the cutting mark printing operation corresponding to the job being executed to the cutting mark printing operation corresponding to the next job. Then, the cutting control device 52 moves the mark detector 40 by the moving device 41 when the cutting mark switching position reaches the cutoff 24. Further, the mark position information is printing position data of a cutting mark in the longitudinal direction of the double-sided corrugated cardboard sheet E. When the cutting mark switching position reaches the cut-off 24, the cutting control device 52 performs the marking by the moving device 41. The detector 40 is moved to the detectable position of the cutting mark after the job change.

  That is, the production management apparatus 53 grasps the print end timing (print end time) of the last cutting mark in the job being executed by the printing apparatus 21. Further, the production management device 53 determines the time until the cutting mark (cutting mark switching position) reaches the cut-off 24 from the distance from the printing device 21 to the cut-off 24 and the conveyance speed of the double-sided cardboard sheet E. I know. Therefore, the cutting control device 52 can calculate the timing (arrival time) at which the cutting mark switching position reaches the cut-off 24 based on the data from the production management device 53. The cut-off 24 may have a counter, and it may be detected from the number of operations of the cut-off 24 that the actual production number of cutting marks corresponding to the job being executed has reached the target production number.

  Further, when changing from the first job to the second job, it is necessary to change the cutting width of the double-sided cardboard sheet E by the slitter scorer 23, and the cutting length of the double-sided cardboard sheet E by the cut-off 24 is changed. Since it is necessary, when changing from the first job to the second job, the switching time of the cutting position of the slitter scorer 23 and the cut-off 24 is required. Further, at this time, a movement time is required for moving the mark detector 40 from the detectable position of the cutting mark in the first job to the detectable position of the cutting mark in the second job. Therefore, the double-sided cardboard sheet E runs idle while the switching time and the movement time elapse.

  Therefore, the idle running length of the double-sided cardboard sheet E is set corresponding to the switching time and the moving time (idle running period). When the first job is changed to the second job, the print control device 51 controls the printing timing of the printing device 21 according to the idle running length of the double-sided cardboard sheet E. That is, when the actual number of printed sheets corresponding to the first job reaches the target number of printed sheets, the print control device 51 clears the idle running length (switching position) of the double-sided cardboard sheet E, that is, the idle running area that does not become a product. After printing, printing corresponding to the second job is started.

  The idle running length of the double-sided cardboard sheet E is a fixed value, and for example, the prescribed idle running length is set in consideration of the switching time and movement time described above, the conveyance speed of the double-sided cardboard sheet E, and the like. The cut length of each job by the cut-off 24 may be set to 1 or 2 times the specified idle run length.

  The mark detector 40 is, for example, a density sensor. The mark detector 40 measures the amount of reflected light from the surface of the double-faced corrugated cardboard sheet E, and distinguishes the image line portion (solid print portion) and the non-image line portion (blank paper portion) based on the reflected light amount value. The cutting control device 52 has data of a cutting mark image (shape, size, color) in advance, and the conveyance direction of the double-sided corrugated cardboard sheet E in the image line portion (solid printing portion) detected by the mark detector 40. Compare the length of and the length of the cutting mark. If the cutting control device 52 determines that the detected image is a cutting mark, the cutting control device 52 cuts the double-sided cardboard sheet E by the cut-off 24.

  The cutting control device 52 corrects the detection result of the mark detector 40 based on the printing color of the cutting mark. That is, the mark detector 40 measures the amount of reflected light from the surface of the double-faced corrugated cardboard sheet E, and the cutting control device 52 distinguishes between the image area and the non-image area based on the amount of reflected light. The amount of reflected light varies depending on the printing color. Therefore, the cutting control device 52 changes the determination value for distinguishing the image line portion from the non-image line portion according to the print color. That is, the sensitivity of the mark detector 40 is adjusted according to the printing color.

  As described above, when the mark detector 40 detects the image printed on the double-sided cardboard sheet E and the cutting control device 52 determines that the detected image is a mark for cutting, the cut-off 24 cuts the double-sided cardboard sheet E. To do. However, when a detection error of the mark detector 40 or a determination error of the cutting control device 52 occurs, the cut-off 24 does not cut the double-sided cardboard sheet E, and the double-sided cardboard sheet is longer than a predetermined length (for example, double length). F flows to the stacker 25 and stacking failure occurs. Therefore, a cutting upper limit length is set by adding a margin length to the cutting length of the double-faced corrugated cardboard sheet E, and the cutting control device 52 detects the cutting mark by the mark detector 40 exceeding the cutting upper limit length. Otherwise, the cut-off 24 cuts the double-sided cardboard sheet E when the upper cutting limit length is exceeded. In this case, the cutting control device 52 receives the cutting length data of the double-sided corrugated cardboard sheet F from the print control device 51 based on the cutting length of the image data, and transports the double-sided corrugated cardboard sheet E per predetermined time. If the length is known and the cutting mark is not determined after a predetermined time, the cutoff 24 is forcibly activated.

  Note that the double-sided corrugated cardboard sheet E generated corresponding to the idle running length of the double-sided cardboard sheet E at the time of job change becomes a defective double-faced cardboard sheet F. Since the production management device 53 recognizes the idle running length of the double-sided cardboard sheet E, when the idle running length region of the double-sided cardboard sheet E reaches the cutoff 24, the cutoff 24 is forced. As a result, the defective double-faced corrugated cardboard sheet F corresponding to the idle running length is removed from the transport line and is removed by the defective removing section 26. Further, when the detection error of the mark detector 40 or the determination error of the cutting control device 52 occurs, the defective double-sided corrugated cardboard sheet generated by forcibly operating the cut-off 24 is also excluded by the defect removing unit 26.

  In the above description, it has been described that the printing device 21 prints a pattern and a cutting mark on the surface of the front liner A. However, at least a part of the pattern is printed without printing a dedicated cutting mark. It may be used as a cutting mark. Alternatively, the front liner A having a pattern printed on the surface in advance may be used, and the printing apparatus 21 may print only the cutting mark in synchronization with the pattern printed in advance.

  The production management device 53 receives the cutting length (target cutting length) of the double-sided corrugated cardboard sheet F from the printing control device 51 and operates the cut-off 24 from the cutting control device 52 to cut the cut length of the double-sided cardboard sheet F. (Actual cutting length) is input, and a deviation between the target cutting length of the double-faced cardboard sheet F and the actual cutting length is calculated. Then, the production management device 53 corrects the print data of the cutting marks by the printing device 21 when the deviation between the target cutting length and the actual cutting length exceeds a preset allowable value.

  The double-sided corrugated cardboard sheet E undergoes processing such as heating, gluing, and pressurization from the time when the single-sided cardboard sheet D and the front liner A are pasted to the cut-off 24, thereby causing expansion and contraction. . In addition, expansion and contraction occur due to the surrounding environment (temperature and humidity). Then, the distance between the cutting marks when the printing apparatus 21 performs printing may be different from the distance between the cutting marks when the cut-off 24 cuts. Therefore, when the deviation between the target cutting length and the actual cutting length exceeds a preset allowable value, the production management device 53 determines the printing size (for example, enlargement rate, reduction rate) of the cutting mark by the printing device 21. to correct.

  Hereinafter, the operation of the cardboard sheet cutting device of the present embodiment will be described. FIG. 3 is a flowchart showing the cutting control at the time of job change, and FIG. 4 is a plan view for explaining the cutting position of the cardboard sheet at the time of job change.

  In the cardboard sheet cutting apparatus of this embodiment, as shown in FIGS. 2 and 3, in step S11, the image of the pattern as image data (job data), the image of the cutting mark, the pattern and the cutting mark The print position, the print color of the pattern and the cutting mark, and the cutting width and cutting length of the double-sided cardboard sheet E are input to the print control device 51. In step S 12, the number of manufactured double-sided cardboard sheets F (target number of manufactured sheets) as production management data (job data) is input to the production management device 53. At this time, a plurality of job data is input and stored in the data storage unit 54.

  In step S13, when a start command for corrugated sheet manufacturing work by the corrugating machine 10 is output to the production management device 53 (Yes), the printing control by the printing control device 51 and the cutting control by the cutting control device 52 are started. On the other hand, if a corrugated machine 10 start command for corrugated machine 10 is not output to the production management device 53 (No), it waits as it is.

  In step S <b> 21, the print control device 51 controls the printing device 21 based on the job data, and the inkjet head 38 prints a pattern and a cutting mark on the surface of the front liner A. On the other hand, in step S31, the cutting control device 52 controls the slitter scorer 23 based on the job data, and the slitter scorer 23 cuts the double-sided cardboard sheet E to a predetermined width along the conveyance direction. In step S <b> 32, the cutting control device 52 determines the presence / absence of a cutting mark based on the detection result from the mark detector 40. When the cutting control device 52 detects a cutting mark (Yes), the cut-off 24 is controlled in step S33, and the cut-off 24 cuts the double-sided cardboard sheet E to a predetermined length along the width direction. By doing so, the double-sided cardboard sheet F is formed.

  On the other hand, if the cutting control device 52 does not detect the cutting mark in step S32 (No), the length of the double-sided cardboard sheet E conveyed after the cut-off 24 is cut in step S34 (double-sided cardboard sheet). It is determined whether (conveyance length) exceeds the upper cutting limit. Here, if it is determined (No) that the double-sided cardboard sheet conveyance length does not exceed the cutting upper limit length, the process returns to step S32. On the other hand, if it is determined that the double-sided cardboard sheet transport length has exceeded the upper cutting limit length (Yes), the cut-off 24 cuts the double-sided cardboard sheet E in step S33, resulting in a defective double-sided cardboard sheet F. Is formed.

  In step S22, it is determined whether the actual number of printed sheets by the printing apparatus 21 has reached the target number of printed sheets. If it is determined (No) that the actual number of printed sheets has not reached the target number of printed sheets, the process returns to step S21. On the other hand, if it is determined that the actual print number has reached the target print number (Yes), it is determined in step S23 whether all print jobs have been completed. If it is determined that all print jobs have not ended (No), the print job is changed in step S24. In step S25, the idle running length of the double-sided cardboard sheet E is set, and then the process returns to step S21 to execute the next print job. That is, after securing the non-printing area corresponding to the idle run length from the printing position of the cutting mark printed corresponding to the job being executed by the printing device 21, the cutting mark corresponding to the next job is printed. To do. On the other hand, if it is determined in step S23 that all print jobs have been completed (Yes), the printing operation is terminated.

  In step S35, it is determined whether or not the switching position (idle length / non-printing area) of the cutting mark for the job being executed and the next job has reached the cutoff 24. If it is determined (No) that the cutting mark switching position has not reached the cut-off 24, the process returns to step S31. On the other hand, if it is determined that the cutting mark switching position has reached the cutoff 24 (Yes), it is determined in step S36 whether all cutting jobs have been completed. Here, if it is determined (No) that all cutting jobs have not ended, the cutting job is changed in step S37. In step S38, the position of the mark detector 42 is changed, and then the process returns to step S31 to execute the next cutting job. On the other hand, if it is determined in step S36 that all cutting jobs have been completed (Yes), the printing operation is terminated.

  Here, the timing of job change in the cardboard sheet cutting apparatus of the present embodiment will be described.

  As shown in FIG. 4, in the first job, a continuous double-sided cardboard sheet E is cut from each end in the width direction by a slitter scorer 23 with a trim width T1 and cut with a cut width S1, and a cut-off 24 Is cut with a cutting length L1. Then, a cutting mark M is printed on the continuous double-sided cardboard sheet E at the position of the cutting length L1 and at the position of the width M1 from one end in the width direction. On the other hand, in the second job, a continuous double-sided corrugated cardboard sheet E is cut from each end in the width direction by the slitter scorer 23 with the trim width T2 and cut with the cut width S2, and the cut length L2 is cut with the cut-off 24. It cuts with. Then, the cutting mark M is printed on the continuous double-sided cardboard sheet E at the position of the cutting length L2 and from one end in the width direction to the position of the width M2. And the idle running length W of the continuous double-sided cardboard sheet E is set.

  When the actual print number of the printing device 21 by the first job reaches the target print number and is changed to the second job, the printing device 21 prints the free running length W after printing the last cutting mark M. After printing, printing of the first cutting mark M in the second job is started. On the other hand, when the switching position of the cutting mark M reaches the cut-off 24 and is changed to the second job, the slitter scorer 23 cuts in the width direction while the double-sided cardboard sheet E is conveyed by the idle running length W. The position and the cutting position in the length direction by the cut-off 24 are changed, and the mark detector 40 is moved to a position where the cutting mark M in the second job can be detected.

  In FIG. 4, the idle running length W is set to a length approximate to one of the cutting length L2. However, since the mark detector 40 may take time to move depending on the position of the cutting mark M, the idle run length W is not limited to this. Since the defective double-sided corrugated cardboard sheet F having the free running length W is removed after being cut at the cut-off 24, for example, the free-running length W may be a plurality of sheets of the length that the cut-off 24 cuts. Good.

  Thus, in the cardboard sheet cutting apparatus of the present embodiment, the printing device 21 that prints the cutting mark M on the double-sided cardboard sheet E, the slitter scorer 23 that cuts the double-sided cardboard sheet E to a predetermined width, A cut-off 24 for cutting the double-sided cardboard sheet E to a predetermined length, a mark detector 40 for detecting a cutting mark M on the double-sided cardboard sheet E, and a control setting value of the mark detector 40 based on print image information. A cutting control device 52 to be changed is provided.

  Accordingly, the printing device 21 prints the cutting mark M on the front liner A, the slitter scorer 23 cuts the double-sided cardboard sheet E to a predetermined width along the longitudinal direction, and the mark detector 40 detects the cutting mark M. Then, the cut-off 24 cuts the double-sided cardboard sheet E into a predetermined length along the width direction. At this time, when the print image information is changed, the cutting control device 52 changes the set value for controlling the mark detector 40, and the continuous cutting operation without stopping the conveyance of the double-faced cardboard sheet E. Thus, the working efficiency can be improved, and the production cost can be reduced by suppressing the generation of waste paper.

  In the cardboard sheet cutting device of this embodiment, the print image information is information for changing the print image printed on the double-sided cardboard sheet E, and the cutting control device 52 uses the mark detector 40 based on the changed print image. Change the control setting value. Therefore, the cutting operation can be performed continuously without stopping the conveyance of the double-faced cardboard sheet E.

  In the cardboard sheet cutting apparatus of the present embodiment, a moving device 41 that moves the mark detector 40 along the width direction of the double-sided cardboard sheet E is provided, and a slitter scorer that changes the print image information as the print image is changed. 23, the control setting value is set as the detection position by the mark detector 40, and the cutting control device 52 uses the moving device 41 to detect the mark detector based on the changed cutting width of the double-sided cardboard sheet E. 40 is moved to the changed detection position. Therefore, continuous cutting work can be performed without stopping the conveyance of the double-faced corrugated cardboard sheet E, the work efficiency can be improved, and the production cost can be reduced by suppressing the generation of waste paper.

  In the cardboard sheet cutting apparatus according to the present embodiment, the print image information is job change information in which the cutting width of the double-sided cardboard sheet E by the slitter scorer 23 is changed while the double-sided cardboard sheet E is being conveyed. When the job is changed, the mark detector 40 is moved by the moving device 41 based on the job change timing data and the mark position information after the job change. Accordingly, when there is a job change in which the cutting width of the double-sided corrugated cardboard sheet E is changed by the slitter scorer 23, the cutting control device 52 performs the mark by the moving device 41 based on the job change timing data and the mark position information after the job change. The detector 40 is moved. That is, the cutting control device 52 moves the mark detector 40 to the position based on the changed mark position information at the timing when the job is changed while the double-sided cardboard sheet E is being conveyed. Therefore, when the job is changed in which the cutting width of the double-sided cardboard sheet E is changed, continuous cutting work can be performed without stopping the conveyance of the double-sided cardboard sheet E, and work efficiency can be improved. Further, the mark detector 40 can be quickly moved to a predetermined position when a job is changed, and the production cost can be reduced by suppressing the generation of waste paper.

  In the cardboard sheet cutting apparatus according to the present embodiment, the job change timing data is used as the target print number data for a predetermined job, and the print control device 51 sets the actual print number of the cutting marks M corresponding to the job being executed as the target. When the number of prints is reached, the printing device 21 switches from printing the cutting mark M corresponding to the job being executed to printing the cutting mark M corresponding to the next job, and the switching position of the cutting mark M is cut off. When it reaches 24, the mark detector 40 is moved by the moving device 41. Therefore, it is possible to continue the cutting operation after changing the job without stopping the conveyance of the double-sided cardboard sheet E.

  In the cardboard sheet cutting apparatus according to the present embodiment, the mark position information is the printing position data of the cutting mark M in the longitudinal direction of the double-sided cardboard sheet E, and the cutting control device 52 is a moving device when a job is changed. 41, the mark detector 40 is moved to a position where the cutting mark M after the job change can be detected. Therefore, it is possible to continue the cutting operation of the double-sided cardboard sheet E even after the job change.

  In the cardboard sheet cutting apparatus according to the present embodiment, when the first job is changed to the second job, the mark detector 40 corresponds to the period during which the mark detector 40 moves from the detectable position in the first job to the detectable position in the second job. Thus, the idle running length of the double-sided cardboard sheet E is set, and the print control device 51 sets the printing timing of the printing device 21 according to the idle running length W of the double-sided cardboard sheet E when the job is changed. Control. Accordingly, the length of the waste paper corresponding to the idle running length W of the double-sided cardboard sheet E is defined by the cutting mark M, so that good products and defective products can be properly sorted, and the double-sided cardboard sheet E The length of the waste paper can be shortened as much as possible.

  In the cardboard sheet cutting apparatus of the present embodiment, as job data, the image of the cutting mark M, the printing position of the cutting mark M, the printing color of the cutting mark M, the cutting width and cutting of the double-sided cardboard sheet E The length and the number of manufactured double-sided cardboard sheets F are set. The print control device 51 controls the printing device 21 based on the job data, and the cutting control device 52 includes a slitter scorer 23, a cut-off 24, and the like. The moving device 41 is controlled. Therefore, printing of the cutting mark M on the front liner A, cutting of the double-sided cardboard sheet E, and movement of the mark detector 40 are performed based on the job data, and control can be simplified.

  In the cardboard sheet cutting device of the present embodiment, a cutting upper limit length is set by adding a margin length to the cutting length of the double-sided cardboard sheet E, and the cutting control device 52 exceeds the cutting upper limit length, and the mark detector When 40 does not detect the cutting mark M, the cut-off 24 is activated when the cutting upper limit length is exceeded. Therefore, even if a detection error of the cutting mark M by the mark detector 40 occurs, the continuous double-sided cardboard sheet E is not conveyed to the stacker 25 side, which adversely affects the stacking and discharging of the double-sided cardboard sheet F. Never give.

  In the cardboard sheet cutting device of this embodiment, the cutting control device 52 corrects the detection result of the mark detector 40 based on the printing color of the cutting mark M. Accordingly, it is possible to improve the detection accuracy by eliminating the undetection of the mark detector 40 due to the change in shading of the cutting mark M.

  In the corrugated cardboard sheet cutting device of this embodiment, the cutting control device 52 calculates the deviation between the target cut length and the actual cut length of the double-faced cardboard sheet E. Therefore, the cutting accuracy of the double-sided cardboard sheet F can be confirmed by the deviation between the target cutting length and the actual cutting length of the double-sided cardboard sheet E.

  In the cardboard sheet cutting device according to the present embodiment, the cutting control device 52 is used for cutting by the printing device 21 when the deviation between the target cutting length of the double-sided cardboard sheet E and the actual cutting length exceeds a preset allowable value. The print data of the mark M is corrected. Therefore, the printing position of the cutting mark M by the printing device 21 can be changed according to the expansion and contraction of the double-sided cardboard sheet E, and the cutting accuracy of the double-sided cardboard sheet F can be improved.

  In the cardboard sheet cutting device of this embodiment, the printing device 21 can print a pattern on the double-sided cardboard sheet E being conveyed, and uses at least a part of the pattern as a cutting mark M. Therefore, it is not necessary to print the dedicated cutting mark M, and the printing cost can be reduced.

  In the cardboard sheet cutting control apparatus according to the present embodiment, the cut-off 24 is controlled based on the detection result of the mark detector 40, and the job change in which the cutting width of the double-sided cardboard sheet F is changed. If there is, the mark detector 40 is moved by the moving device 41 based on the job change timing data and the mark position information after the job change.

  Therefore, when there is a job change in which the cut width of the double-sided corrugated cardboard sheet E is changed by the cut-off 24, the mark detector 40 is moved by the moving device 41 based on the job change timing data and the mark position information after the job change. . Therefore, when the job is changed in which the cutting width of the double-sided cardboard sheet E is changed, continuous cutting work can be performed without stopping the conveyance of the double-sided cardboard sheet E, and work efficiency can be improved. Further, the mark detector 40 can be quickly moved to a predetermined position when a job is changed, and the production cost can be reduced by suppressing the generation of waste paper.

  In the corrugated sheet manufacturing apparatus of the present embodiment, the single facer 15 for manufacturing the single-sided corrugated cardboard sheet D by bonding the back liner C to the corrugated core paper (core B), and the single facer A double facer 20 for manufacturing a double-faced corrugated cardboard sheet E by bonding the front liner A to the center B side of the single-faced cardboard sheet D manufactured by the support 15 is provided, and the cutoff 24 is based on the detection result of the mark detector 40. Cutting that moves the mark detector 40 by the moving device 41 based on the job change timing data and the mark position information after the job change when there is a job change in which the cutting width of the double-sided cardboard sheet F is changed. A control device 52 is provided.

  Accordingly, the single facer 15 manufactures the single-sided cardboard sheet D by pasting the back liner C on the corrugated core paper (core B), and the double facer 20 is provided on the core B side of the single-sided cardboard sheet D. The liner A is bonded to produce a double-sided cardboard sheet E. At this time, the printing device 21 prints the cutting mark M on the front liner A, the slitter scorer 23 cuts the double-faced cardboard sheet E to a predetermined width along the longitudinal direction, and the mark detector 40 puts the cutting mark M on the front liner A. When detected, the cut-off 24 cuts the double-faced cardboard sheet E to a predetermined length along the width direction. When there is a job change in which the cut width of the double-sided corrugated cardboard sheet E is changed by the cut-off 24, the mark detector 40 is moved by the moving device 41 based on the job change timing data and the mark position information after the job change. . That is, the cutting control device 52 moves the mark detector 40 to the position based on the changed mark position information at the timing when the job is changed while the double-sided cardboard sheet E is being conveyed. Therefore, when the job is changed in which the cutting width of the double-sided cardboard sheet E is changed, continuous cutting work can be performed without stopping the conveyance of the double-sided cardboard sheet E, and work efficiency can be improved. Further, the mark detector 40 can be quickly moved to a predetermined position when a job is changed, and the production cost can be reduced by suppressing the generation of waste paper.

  In the above-described embodiment, the mark detector 40 is a density sensor, the image line portion and the non-image line portion are distinguished according to the amount of reflected light from the surface of the double-faced cardboard sheet E, and the presence or absence of the cutting mark M However, the present invention is not limited to this configuration. For example, various sensors such as a laser sensor, a CCD camera, or the like may be applied instead of the density sensor.

  In the above-described embodiment, the cutting mark M is printed at the positions of the widths M1 and M2 from the one end in the width direction of the double-sided cardboard sheet E at the positions of the cutting lengths L1 and L2. The printing position of the cutting mark M is not limited to this position. For example, the cutting mark M may be printed at a position shifted in the length direction of the double-sided cardboard sheet E from the position of the cutting lengths L1 and L2. Further, the number of prints of the cutting mark M is not limited to one, and a plurality of marks may be printed.

10 Corrugating machine (corrugated cardboard sheet manufacturing equipment)
DESCRIPTION OF SYMBOLS 11 Mill roll stand 12 Preheater 13 Mill roll stand 14 Pre heater 15 Single facer 16 Bridge 17 Mill roll stand 18 Pre heater 19 Glue machine 20 Double facer 21 Printing device 22 Rotary shear 23 Slitter scorer (1st cutting machine)
24 Cut-off (second cutting machine)
25 Stacker 38 Inkjet head 39 Drying device 40 Mark detector 41 Moving device 51 Print control device 52 Cutting control device 53 Production management device 54 Data storage section A Table liner (first liner)
B Core C Back liner (second liner)
D Single-sided cardboard sheet E, F Double-sided cardboard sheet

Claims (15)

A digital printing machine for printing a cutting mark on a corrugated cardboard sheet being conveyed;
A first cutting machine for cutting the corrugated cardboard sheet being conveyed into a predetermined width along the longitudinal direction;
A second cutting machine for cutting the corrugated cardboard sheet being conveyed into a predetermined length along the width direction;
A mark detector for detecting the cutting mark in the corrugated cardboard sheet being conveyed;
A control device for controlling the operation of the first cutting machine and the second cutting machine and changing a control setting value of the mark detector based on print image information;
A cardboard sheet cutting apparatus characterized by comprising:   The print image information is information for changing a print image printed on the cardboard sheet, and the control device changes a control setting value of the mark detector based on the changed print image. The cardboard sheet cutting device according to claim 1.   A moving device that moves the mark detector along the width direction of the cardboard sheet is provided, and the print image information is changed in accordance with the change of the print image. The cutting of the cardboard sheet by the first cutting machine The control setting value is a detection position by the mark detector, and the control device detects the mark detector by changing the mark detector by the moving device based on the cutting width of the corrugated cardboard sheet to be changed. The cardboard sheet cutting device according to claim 2, wherein the cardboard sheet cutting device moves to a position.   The print image information is job change information in which a cutting width of the cardboard sheet by the first cutting machine is changed during conveyance of the cardboard sheet, and the control device changes the job when there is a job change. 2. The cardboard sheet cutting device according to claim 1, wherein the mark detector is moved by the moving device based on timing data and mark position information after the job is changed.   The job change timing data includes data of a target print number for a predetermined job, and the control device, when the actual print number of the cutting mark corresponding to the job being executed reaches the target print number, When the digital printing machine switches from printing the cutting mark corresponding to the job being executed to printing the cutting mark corresponding to the next job, and the switching position of the cutting mark reaches the second cutting machine 5. The cardboard sheet cutting device according to claim 4, wherein the mark detector is moved by the moving device.   The mark position information is print position data of the cutting mark in the longitudinal direction of the corrugated cardboard sheet, and the control device moves the mark detector after the job is changed by the moving device when the job is changed. The cardboard sheet cutting apparatus according to claim 4 or 5, wherein the cardboard sheet cutting apparatus moves to a position where the cutting mark can be detected.   When the print image information of the first job is changed to the print image information of the second job, the mark detector corresponds to a period during which the mark detector moves from a detectable position in the first job to a detectable position in the second job. The idle running length of the corrugated cardboard sheet is set, and the control device controls the printing timing of the digital printing machine according to the idle running length when a job is changed. The cardboard sheet cutting device according to any one of claims 1 to 6.   As job data, an image of the cutting mark, a printing position of the cutting mark, a printing color of the cutting mark, a cutting width and a cutting length of the cardboard sheet, and the number of manufactured cardboard sheets are set. The control device controls the digital printing machine, the first cutting machine, the second cutting machine, and the moving device based on the job data. The cardboard sheet cutting device according to any one of the above.   When a cutting upper limit length is set by adding a margin length to the cutting length of the corrugated cardboard sheet, the control device exceeds the cutting upper limit length and the mark detector does not detect the cutting mark The cardboard sheet cutting device according to claim 8, wherein the second cutting machine is operated when the upper cutting limit length is exceeded.   The print image information is a printing color of the cutting mark, and the control device corrects a detection result of the mark detector based on a printing color of the cutting mark. The cardboard sheet cutting apparatus according to any one of the above.   The cardboard sheet cutting device according to any one of claims 1 to 10, wherein the control device calculates a deviation between a target cutting length and an actual cutting length of the cardboard sheet.   The control device corrects print data of a cutting mark by the digital printer when a deviation between the target cutting length and the actual cutting length exceeds a preset allowable value. Item 12. The cardboard sheet cutting device according to Item 11.   The digital printing machine is capable of printing a pattern on a corrugated cardboard sheet being conveyed, and uses at least a part of the pattern as the cutting mark. A cardboard sheet cutting apparatus according to claim 1. A digital printing machine for printing a cutting mark on a corrugated cardboard sheet being conveyed;
A first cutting machine for cutting the corrugated cardboard sheet being conveyed into a predetermined width along the longitudinal direction;
A mark detector for detecting the cutting mark in the corrugated cardboard sheet being conveyed;
A second cutting machine for cutting the cardboard sheet being conveyed into a predetermined length along the width direction based on the detection result of the mark detector;
In a cardboard sheet cutting apparatus having
Changing the control setting value of the mark detector based on print image information;
A cardboard sheet cutting control device. A single facer for producing a single-sided cardboard sheet by laminating a second liner to a corrugated core paper;
A double facer for producing a double-sided cardboard sheet by bonding a first liner to the core paper side of the single-sided cardboard sheet;
A cardboard sheet cutting device according to any one of claims 1 to 13,
An apparatus for producing a corrugated cardboard sheet.

Images